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by rrobukef
1289 days ago
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In 1999-ish, my two brothers and I got a box of relays and some reed sensors and solenoids (for track-switches) embedded in lego blocks. We're all engineers now, the box is treasured and still works. Finding a PC with a parallel port has become challenging though. |
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Plus there are a bunch of off the shelf solutions on Amazon (YMMV).